I recently acquired a sunbeam alpine and the previous owner was thinking about making a tiger clone out of it but decided to get out of the project, anyway when I got the car I also got a roll bar, which he said was out of tiger from southern cal...The bar is not welded or bolted to the car....I like the bar but would like to get other more original parts like a soft top, tanneau cover, or hard top...I would trade the bar for a hard top or a soft top with a tanneau cover...I would like ones that in good condition...don't have to be new...I don't know what the value of the bar is so I don't know if this is a ridiculous trade either way but I am sure you guys will let me know.... Just trying to get creative in finding parts.

Keep in mind the roll bars value is probably around $200 to $250.
They are also very tough to ship.
Hard tops, particularly for SIII to SV are worth quite a bit more than the roll bar will be. Soft top frames are cheap and plentiful, but then you need the top itself and possibly trim pieces you may lack.

You dont say what year your car is, this is extremely relevant for top parts.

If you ever plan to put a roll bar in the car, keep what you have and save a ton of future money.

Just for reference pricewise, Sunbeam Specialties has new soft tops @ $297 and new tonneau covers @ $279. A professional convertible top shop charged me $400 to install my soft top. Those items, used, would be subject to condition and a negotiated price with the seller. My suggestion would be to go with the new items. I think you would be much happier in the long run. By the way, I have never used my tonneau cover. I put it on once to see if it fit properly ( it did ). If you are interested in a tonneau, you could have mine for a smokin' deal. It is the one with a zipper down the middle so you can close off one side if you wish. $100 plus shipping cost. I have no plans to ever use it.